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6x+9+15x+19=100
We simplify the equation to the form, which is simple to understand
6x+9+15x+19=100
We move all terms containing x to the left and all other terms to the right.
+6x+15x=+100-9-19
We simplify left and right side of the equation.
+21x=+72
We divide both sides of the equation by 21 to get x.
x=3.42857142857
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